Mom is a New Half

During the day, Iwataro is a "normal" salaryman working for an "elite" company
and warding off female admirers, who consider him quite a catch. At night, he changes into Runa, a female entertainer, but he keeps this second life a secret from his acquaintances.
The secret becomes a little more difficult to keep when a little boy named Kiyoto enters his life and claims that Iwataro is his father. Iwataro doesn't argue with the kid. He knows perfectly well that he could be telling the truth.